<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div class="box">7778</div>

</body>
</html>
<script src="js/jquery-1.10.1.js"></script>
<script>
    $(function () {
        $(".box").css("color","yellow");
    })
</script>